$\frac{d}{dx}\left(x=80\cdot e^{\frac{y}{15}}\right)$
$100x^2-\frac{16}{36}$
$\lim_{x\to2}\left(2x^3-10x\right)$
$\frac{\left(sin\:x+cos\:x\right)^2}{1+2sin\:x\:cos\:x}=1$
$32=x^2+x$
$\left(7+x\right)\left(7-x\right)^2$
$25 = 7 + r$
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